2014-05-04 13:32:02 +00:00
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2014-08-10 12:36:39 +00:00
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function draw_ellipse(ctx, x, y, w, h, stroke, fill){
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2014-05-20 05:31:32 +00:00
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var stroke_color = ctx.strokeStyle;
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var fill_color = ctx.fillStyle;
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2014-05-04 13:32:02 +00:00
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var r1 = Math.round;
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var r2 = Math.round;
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var cx = x + w/2;
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var cy = y + h/2;
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if(aliasing){
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ctx.fillStyle = stroke_color;
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for(var r=0; r<TAU; r+=0.01){
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var rx = Math.cos(r) * w/2;
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var ry = Math.sin(r) * h/2;
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var rect_x = r1(cx+rx);
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var rect_y = r1(cy+ry);
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var rect_w = r2(-rx*2);
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var rect_h = r2(-ry*2);
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ctx.fillRect(rect_x+1, rect_y, rect_w, rect_h);
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ctx.fillRect(rect_x, rect_y+1, rect_w, rect_h);
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ctx.fillRect(rect_x-1, rect_y, rect_w, rect_h);
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ctx.fillRect(rect_x, rect_y-1, rect_w, rect_h);
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}
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ctx.fillStyle = fill_color;
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for(var r=0; r<TAU; r+=0.01){
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var rx = Math.cos(r) * w/2;
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var ry = Math.sin(r) * h/2;
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ctx.fillRect(
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2014-05-23 07:55:19 +00:00
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r1(cx+rx),
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r1(cy+ry),
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r2(-rx*2),
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r2(-ry*2)
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2014-05-04 13:32:02 +00:00
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);
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}
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}else{
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if(w<0){ x+=w; w=-w; }
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if(h<0){ y+=h; h=-h; }
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ctx.beginPath();
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ctx.ellipse(cx, cy, w/2, h/2, 0, TAU, false);
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ctx.stroke();
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ctx.fill();
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}
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}
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function draw_rounded_rectangle(ctx, x, y, width, height, radius){
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2014-05-20 05:31:32 +00:00
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var stroke_color = ctx.strokeStyle;
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var fill_color = ctx.fillStyle;
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2014-05-04 13:32:02 +00:00
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if(aliasing){
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var iw = width - radius*2;
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var ih = height - radius*2;
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var ix = x+radius;
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var iy = y+radius;
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var r1 = Math.round;
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var r2 = Math.round;
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ctx.fillStyle = stroke_color;
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for(var r=0; r<TAU; r+=0.05){
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var rx = Math.cos(r) * radius;
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var ry = Math.sin(r) * radius;
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var rect_x = r1(ix+rx);
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var rect_y = r1(iy+ry);
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var rect_w = r2(iw-rx*2);
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var rect_h = r2(ih-ry*2);
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ctx.fillRect(rect_x+1, rect_y, rect_w, rect_h);
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ctx.fillRect(rect_x, rect_y+1, rect_w, rect_h);
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ctx.fillRect(rect_x-1, rect_y, rect_w, rect_h);
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ctx.fillRect(rect_x, rect_y-1, rect_w, rect_h);
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}
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ctx.fillStyle = fill_color;
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for(var r=0; r<TAU; r+=0.05){
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var rx = Math.cos(r) * radius;
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var ry = Math.sin(r) * radius;
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ctx.fillRect(
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r1(ix+rx),
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r1(iy+ry),
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r2(iw-rx*2),
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r2(ih-ry*2)
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);
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}
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}else{
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ctx.beginPath();
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ctx.moveTo(x + radius, y);
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ctx.lineTo(x + width - radius, y);
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ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
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ctx.lineTo(x + width, y + height - radius);
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ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
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ctx.lineTo(x + radius, y + height);
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ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
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ctx.lineTo(x, y + radius);
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ctx.quadraticCurveTo(x, y, x + radius, y);
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ctx.closePath();
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ctx.stroke();
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ctx.fill();
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}
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}
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function draw_line(ctx, x1, y1, x2, y2){
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if(aliasing){
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2014-08-11 20:45:55 +00:00
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bresenham_line(x1, y1, x2, y2, function(x, y){
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2014-05-04 13:32:02 +00:00
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ctx.fillRect(x, y, 1, 1);
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});
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}else{
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ctx.beginPath();
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ctx.moveTo(x1, y1);
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ctx.lineTo(x2, y2);
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2014-08-10 15:09:56 +00:00
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ctx.lineCap = "round";
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2014-05-04 13:32:02 +00:00
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ctx.stroke();
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2014-08-08 21:44:46 +00:00
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ctx.lineCap = "butt";
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2014-05-04 13:32:02 +00:00
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}
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}
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2014-08-11 20:45:55 +00:00
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function bresenham_line(x1, y1, x2, y2, callback){
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2014-05-04 13:32:02 +00:00
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// Bresenham's line algorithm
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x1=~~x1, x2=~~x2, y1=~~y1, y2=~~y2;
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var dx = Math.abs(x2 - x1);
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var dy = Math.abs(y2 - y1);
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var sx = (x1 < x2) ? 1 : -1;
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var sy = (y1 < y2) ? 1 : -1;
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var err = dx - dy;
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while(1){
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callback(x1, y1);
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if(x1===x2 && y1===y2) break;
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var e2 = err*2;
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if(e2 >-dy){ err -= dy; x1 += sx; }
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if(e2 < dx){ err += dx; y1 += sy; }
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}
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}
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2014-08-11 20:45:55 +00:00
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function brosandham_line(x1, y1, x2, y2, callback){
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2014-05-15 17:14:23 +00:00
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// Bresenham's line algorithm modified to callback in-between going horizontal and vertical
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x1=~~x1, x2=~~x2, y1=~~y1, y2=~~y2;
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var dx = Math.abs(x2 - x1);
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var dy = Math.abs(y2 - y1);
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var sx = (x1 < x2) ? 1 : -1;
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var sy = (y1 < y2) ? 1 : -1;
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var err = dx - dy;
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while(1){
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callback(x1, y1);
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if(x1===x2 && y1===y2) break;
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var e2 = err*2;
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if(e2 >-dy){ err -= dy; x1 += sx; }
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callback(x1, y1);
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if(e2 < dx){ err += dx; y1 += sy; }
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}
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}
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2014-10-01 19:46:35 +00:00
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function draw_fill(ctx, x, y, fill_r, fill_g, fill_b, fill_a){
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var stack = [[x, y]];
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var c_width = canvas.width;
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var c_height = canvas.height;
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var id = ctx.getImageData(0, 0, c_width, c_height);
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pixel_pos = (y*c_width + x) * 4;
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var start_r = id.data[pixel_pos+0];
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var start_g = id.data[pixel_pos+1];
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var start_b = id.data[pixel_pos+2];
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var start_a = id.data[pixel_pos+3];
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if(
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fill_r === start_r &&
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fill_g === start_g &&
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fill_b === start_b &&
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fill_a === start_a
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){
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return;
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}
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while(stack.length){
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var new_pos, x, y, pixel_pos, reach_left, reach_right;
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new_pos = stack.pop();
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x = new_pos[0];
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y = new_pos[1];
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pixel_pos = (y*c_width + x) * 4;
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while(match_start_color(pixel_pos)){
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pixel_pos -= c_width * 4, y--;
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}
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pixel_pos += c_width * 4, y++;
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reach_left = false;
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reach_right = false;
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while(y++ < c_height && match_start_color(pixel_pos)){
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color_pixel(pixel_pos);
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if(x > 0){
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if(match_start_color(pixel_pos - 4)){
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if(!reach_left){
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stack.push([x - 1, y]);
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reach_left = true;
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}
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}else if(reach_left){
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reach_left = false;
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}
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}
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if(x < c_width-1){
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if(match_start_color(pixel_pos + 4)){
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if(!reach_right){
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stack.push([x + 1, y]);
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reach_right = true;
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}
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}else if(reach_right){
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reach_right = false;
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}
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}
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pixel_pos += c_width * 4;
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}
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}
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ctx.putImageData(id, 0, 0);
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function match_start_color(pixel_pos){
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return (
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id.data[pixel_pos+0] === start_r &&
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id.data[pixel_pos+1] === start_g &&
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id.data[pixel_pos+2] === start_b &&
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id.data[pixel_pos+3] === start_a
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);
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}
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function color_pixel(pixel_pos){
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id.data[pixel_pos+0] = fill_r;
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id.data[pixel_pos+1] = fill_g;
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id.data[pixel_pos+2] = fill_b;
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id.data[pixel_pos+3] = fill_a;
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}
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}
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