John Alanbrook
792da2ce4b
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477 lines
14 KiB
JavaScript
477 lines
14 KiB
JavaScript
var render = use('render')
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var graphics = use('graphics')
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var math = use('math')
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var util = use('util')
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var os = use('os')
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var geometry = use('geometry')
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var draw = {}
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draw[prosperon.DOC] = `
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A collection of 2D drawing functions that operate in screen space. Provides primitives
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for lines, rectangles, text, sprite drawing, etc. Immediate mode.
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`
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/*var whiteimage = {}
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whiteimage = graphics.make_surface([1,1])
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whiteimage.rect({x:0,y:0,width:1,height:1}, [1,1,1,1])
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render.load_texture(whiteimage)
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*/
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if (render.point)
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draw.point = function(pos,size,opt = {color:Color.white}, pipeline) {
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render.settings(opt)
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render.pipeline(pipeline)
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render.point([pos])
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}
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else
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draw.point = function() { throw new Error('Backend cannot draw points.') }
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draw.point[prosperon.DOC] = `
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:param pos: A 2D position ([x, y]) where the point should be drawn.
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:param size: The size of the point.
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:param color: The color of the point, defaults to white.
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:return: None
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`
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/* ------------------------------------------------------------------------
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* helper – is (dx,dy) inside the desired wedge?
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* -------------------------------------------------------------------- */
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function within_wedge(dx, dy, start, end, full_circle)
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{
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if (full_circle) return true
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var ang = Math.atan2(dy, dx) // [-π,π]
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if (ang < 0) ang += Math.PI * 2
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var t = ang / (Math.PI * 2) // turn ∈ [0,1)
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if (start <= end) return t >= start && t <= end
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return t >= start || t <= end // wrap-around arc
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}
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/* ------------------------------------------------------------------------
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* software ellipse – outline / ring / fill via inner_radius
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* -------------------------------------------------------------------- */
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function software_ellipse(pos, radii, opt)
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{
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var rx = radii[0], ry = radii[1]
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if (rx <= 0 || ry <= 0) return
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var cx = pos[0], cy = pos[1]
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var raw_start = opt.start
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var raw_end = opt.end
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var full_circle = Math.abs(raw_end - raw_start) >= 1 - 1e-9
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var start = (raw_start % 1 + 1) % 1
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var end = (raw_end % 1 + 1) % 1
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var thickness = Math.max(1, opt.thickness|0)
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/* inner ellipse radii (may be zero or negative → treat as no hole) */
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var rx_i = rx - thickness,
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ry_i = ry - thickness
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var hole = (rx_i > 0 && ry_i > 0)
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/* fast one-pixel outline ? --------------------------------------- */
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if (!hole && thickness === 1) {
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/* (same midpoint algorithm as before, filtered by wedge) --------*/
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var rx_sq = rx * rx, ry_sq = ry * ry
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var two_rx_sq = rx_sq << 1, two_ry_sq = ry_sq << 1
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var x = 0, y = ry, px = 0, py = two_rx_sq * y
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var p = ry_sq - rx_sq * ry + 0.25 * rx_sq
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function plot_pts(x, y) {
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var pts = [
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[cx + x, cy + y], [cx - x, cy + y],
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[cx + x, cy - y], [cx - x, cy - y]
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].filter(pt => within_wedge(pt[0]-cx, pt[1]-cy, start, end, full_circle))
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if (pts.length) render.point(pts)
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}
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while (px < py) {
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plot_pts(x, y)
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++x; px += two_ry_sq
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if (p < 0) p += ry_sq + px
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else { --y; py -= two_rx_sq; p += ry_sq + px - py }
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}
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p = ry_sq*(x+.5)*(x+.5) + rx_sq*(y-1)*(y-1) - rx_sq*ry_sq
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while (y >= 0) {
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plot_pts(x, y)
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--y; py -= two_rx_sq
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if (p > 0) p += rx_sq - py
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else { ++x; px += two_ry_sq; p += rx_sq - py + px }
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}
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return
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}
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/* ------------------------------------------------------------------
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* FILL or RING (thickness ≥ 2 OR hole == false -> full fill)
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* ---------------------------------------------------------------- */
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var strips = []
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var rx_sq = rx * rx, ry_sq = ry * ry
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var rx_i_sq = rx_i * rx_i, ry_i_sq = ry_i * ry_i
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for (var dy = -ry; dy <= ry; ++dy) {
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var yy = dy * dy
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var x_out = Math.floor(rx * Math.sqrt(1 - yy / ry_sq))
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var y_screen = cy + dy
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/* optional inner span */
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var x_in = hole ? Math.floor(rx_i * Math.sqrt(1 - yy / ry_i_sq)) : -1
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var run_start = null
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for (var dx = -x_out; dx <= x_out; ++dx) {
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if (hole && Math.abs(dx) <= x_in) { run_start = null; continue }
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if (!within_wedge(dx, dy, start, end, full_circle)) { run_start = null; continue }
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if (run_start === null) run_start = cx + dx
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var last = (dx === x_out)
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var next_in_ring =
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!last &&
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!(hole && Math.abs(dx+1) <= x_in) &&
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within_wedge(dx+1, dy, start, end, full_circle)
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if (last || !next_in_ring) {
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strips.push({
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x: run_start,
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y: y_screen,
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width: (cx + dx) - run_start + 1,
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height: 1
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})
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run_start = null
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}
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}
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}
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if (strips.length) render.rects(strips)
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}
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var ellipse_def = {
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color: Color.white,
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start: 0,
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end: 1,
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mode: 'fill',
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thickness: 1,
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}
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if (render.ellipse)
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draw.ellipse = function(pos, radii, def, pipeline) {
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}
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else
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draw.ellipse = function(pos, radii, def, pipeline) {
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var opt = def ? {...ellipse_def, ...def} : ellipse_def
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render.settings(opt)
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render.pipeline(pipeline)
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if (opt.thickness <= 0) opt.thickness = Math.max(radii[0], radii[1])
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software_ellipse(pos, radii, opt)
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}
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var line_def = {
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color: Color.white,
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thickness: 1,
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cap:"butt",
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}
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draw.line = function(points, def, pipeline)
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{
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var opt
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if (def)
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opt = {...line_def, ...def}
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else
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opt = line_def
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render.settings(opt)
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render.pipeline(pipeline)
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render.line(points)
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}
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draw.cross = function render_cross(pos, size, def, pipe) {
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var a = [pos.add([0, size]), pos.add([0, -size])]
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var b = [pos.add([size, 0]), pos.add([-size, 0])]
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draw.line(a, def, pipe)
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draw.line(b, def,pipe)
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}
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draw.arrow = function render_arrow(start, end, wingspan = 4, wingangle = 10, def, pipe) {
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var dir = math.norm(end.sub(start))
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var wing1 = [math.rotate(dir, wingangle).scale(wingspan).add(end), end]
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var wing2 = [math.rotate(dir, -wingangle).scale(wingspan).add(end), end]
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draw.line([start, end], def, pipe)
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draw.line(wing1, def, pipe)
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draw.line(wing2, def, pipe)
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}
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/* ------------------------------------------------------------------------
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* helper – plain rectangle outline of arbitrary thickness (radius=0)
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* -------------------------------------------------------------------- */
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function software_outline_rect(rect, thickness)
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{
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if (thickness <= 0) {
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render.rectangle(rect);
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return;
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}
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/* stroke swallows the whole thing → fill instead */
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if ((thickness << 1) >= rect.width ||
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(thickness << 1) >= rect.height) {
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render.rectangle(rect) // filled
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return
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}
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const x0 = rect.x,
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y0 = rect.y,
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x1 = rect.x + rect.width,
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y1 = rect.y + rect.height
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render.rects([
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{ x:x0, y:y0, width:rect.width, height:thickness }, // top
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{ x:x0, y:y1-thickness, width:rect.width, height:thickness }, // bottom
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{ x:x0, y:y0+thickness, width:thickness,
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height:rect.height - (thickness<<1) }, // left
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{ x:x1-thickness, y:y0+thickness, width:thickness,
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height:rect.height - (thickness<<1) } // right
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])
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}
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/* ------------------------------------------------------------------------
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* ROUNDED rectangle outline (was software_round_rect)
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* -------------------------------------------------------------------- */
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function software_round_rect(rect, radius, thickness = 1)
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{
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if (thickness <= 0) {
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software_fill_round_rect(rect, radius)
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return
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}
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radius = Math.min(radius, rect.width >> 1, rect.height >> 1)
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/* stroke covers whole rect → fall back to fill ------------------- */
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if ((thickness << 1) >= rect.width ||
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(thickness << 1) >= rect.height ||
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thickness >= radius) {
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software_fill_round_rect(rect, radius)
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return
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}
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const x0 = rect.x,
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y0 = rect.y,
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x1 = rect.x + rect.width - 1, // inclusive
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y1 = rect.y + rect.height - 1
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const cx_l = x0 + radius, cx_r = x1 - radius
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const cy_t = y0 + radius, cy_b = y1 - radius
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const r_out = radius
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const r_in = radius - thickness
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/* straight bands (top/bottom/left/right) ------------------------- */
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render.rects([
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{ x:x0 + radius, y:y0, width:rect.width - (radius << 1),
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height:thickness }, // top
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{ x:x0 + radius, y:y1 - thickness + 1,
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width:rect.width - (radius << 1), height:thickness }, // bottom
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{ x:x0, y:y0 + radius, width:thickness,
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height:rect.height - (radius << 1) }, // left
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{ x:x1 - thickness + 1, y:y0 + radius, width:thickness,
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height:rect.height - (radius << 1) } // right
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])
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/* corner arcs ---------------------------------------------------- */
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const strips = []
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for (let dy = 0; dy < radius; ++dy) {
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const dy_sq = dy * dy
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const dx_out = Math.floor(Math.sqrt(r_out * r_out - dy_sq))
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const dx_in = (r_in > 0 && dy < r_in)
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? Math.floor(Math.sqrt(r_in * r_in - dy_sq))
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: -1 // no inner rim
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const w = dx_out - dx_in // strip width
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if (w <= 0) continue
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/* top */
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strips.push(
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{ x:cx_l - dx_out, y:cy_t - dy, width:w, height:1 }, // NW
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{ x:cx_r + dx_in + 1, y:cy_t - dy, width:w, height:1 } // NE
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)
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/* bottom */
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strips.push(
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{ x:cx_l - dx_out, y:cy_b + dy, width:w, height:1 }, // SW
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{ x:cx_r + dx_in + 1, y:cy_b + dy, width:w, height:1 } // SE
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)
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}
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render.rects(strips)
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}
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/* ------------------------------------------------------------------------
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* filled rounded rect (unchanged)
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* -------------------------------------------------------------------- */
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function software_fill_round_rect(rect, radius)
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{
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radius = Math.min(radius, rect.width >> 1, rect.height >> 1)
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const x0 = rect.x,
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y0 = rect.y,
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x1 = rect.x + rect.width - 1,
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y1 = rect.y + rect.height - 1
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/* main column */
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render.rects([
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{ x:x0 + radius, y:y0, width:rect.width - (radius << 1),
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height:rect.height }
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])
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/* side columns */
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render.rects([
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{ x:x0, y:y0 + radius, width:radius,
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height:rect.height - (radius << 1) },
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{ x:x1 - radius + 1, y:y0 + radius, width:radius,
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height:rect.height - (radius << 1) }
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])
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/* corner caps */
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const cx_l = x0 + radius, cx_r = x1 - radius
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const cy_t = y0 + radius, cy_b = y1 - radius
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const caps = []
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for (let dy = 0; dy < radius; ++dy) {
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const dx = Math.floor(Math.sqrt(radius * radius - dy * dy))
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const w = (dx << 1) + 1
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caps.push(
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{ x:cx_l - dx, y:cy_t - dy, width:w, height:1 },
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{ x:cx_r - dx, y:cy_t - dy, width:w, height:1 },
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{ x:cx_l - dx, y:cy_b + dy, width:w, height:1 },
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{ x:cx_r - dx, y:cy_b + dy, width:w, height:1 }
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)
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}
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render.rects(caps)
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}
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var rect_def = {
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thickness:1,
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color: Color.white,
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radius: 0
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}
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draw.rectangle = function render_rectangle(rect, def, pipeline) {
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var opt = def ? {...rect_def, ...def} : rect_def
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render.settings(opt)
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render.pipeline(pipeline)
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var t = opt.thickness|0
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if (t <= 0) {
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if (opt.radius)
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software_fill_round_rect(rect, opt.radius)
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else
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render.rectangle(rect)
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return
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}
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if (opt.radius)
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software_round_rect(rect, opt.radius, t)
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else
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software_outline_rect(rect,t)
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}
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var slice9_info = {
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tile_top:true,
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tile_bottom:true,
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tile_left:true,
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tile_right:true,
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tile_center_x:true,
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tile_center_right:true,
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color: Color.white,
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}
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draw.slice9 = function slice9(image, rect = [0,0], slice = 0, info = slice9_info, pipeline) {
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if (!image) throw Error('Need an image to render.')
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if (typeof image === "string")
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image = graphics.texture(image)
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render.slice9(image, rect, slice, slice9_info, pipeline);
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}
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draw.slice9[prosperon.DOC] = `
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:param image: An image object or string path to a texture.
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:param rect: A rectangle specifying draw location/size, default [0, 0].
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:param slice: The pixel inset or spacing for the 9-slice (number or object).
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:param info: A slice9 info object controlling tiling of edges/corners.
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:param pipeline: (Optional) A pipeline or rendering state object.
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:return: None
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:raises Error: If no image is provided.
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`
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var std_sprite_cmd = {type:'sprite', color:[1,1,1,1]}
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var image_info = {
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tile_x: false,
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tile_y: false,
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flip_x: false,
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flip_y: false,
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color: Color.white,
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mode: 'linear'
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}
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draw.image = function image(image, rect = [0,0], rotation = 0, anchor = [0,0], shear = [0,0], info = {}, pipeline) {
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if (!image) throw Error('Need an image to render.')
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if (typeof image === "string")
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image = graphics.texture(image)
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rect.width ??= image.texture.width
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rect.height ??= image.texture.height
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info ??= image_info;
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render.settings(info)
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render.image(image, rect, rotation, anchor, shear, info)
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}
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function software_circle(pos, radius)
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{
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if (radius <= 0) return // nothing to draw
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var cx = pos[0], cy = pos[1]
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var x = 0, y = radius
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var d = 3 - (radius << 1) // decision parameter
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while (x <= y) {
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draw.point([
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[cx + x, cy + y], [cx - x, cy + y],
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[cx + x, cy - y], [cx - x, cy - y],
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[cx + y, cy + x], [cx - y, cy + x],
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[cx + y, cy - x], [cx - y, cy - x]
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])
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if (d < 0) d += (x << 2) + 6
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else {
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d += ((x - y) << 2) + 10
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y--
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}
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x++
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}
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}
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var circle_def = {
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inner_radius:1, // percentage: 1 means filled circle
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color: Color.white,
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start:0,
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end: 1,
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}
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draw.circle = function render_circle(pos, radius, def, pipeline) {
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draw.ellipse(pos, [radius,radius], def, pipeline)
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}
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var sysfont = graphics.get_font('fonts/c64.ttf', 8)
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draw.text = function text(text, rect, font = sysfont, size = 0, color = Color.white, wrap = 0, pipeline) {
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if (typeof font === 'string') font = graphics.get_font(font)
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var mesh = graphics.make_text_buffer(text, rect, 0, color, wrap, font)
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render.geometry(font, mesh)
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}
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draw.text[prosperon.DOC] = `
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:param text: The string to draw.
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:param rect: A rectangle specifying draw position (and possibly wrapping area).
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:param font: A font object or string path, default sysfont.
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:param size: (Unused) Possibly intended for scaling the font size.
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:param color: The text color, default Color.white.
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:param wrap: Pixel width for text wrapping, default 0 (no wrap).
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:param pipeline: (Optional) A pipeline or rendering state object.
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:return: None
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`
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return draw
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