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Implemented an extremely basic DrawArc function (needs replaced with something better and more versatile).

improved_timing
Ian Burgmyer 7 years ago
parent
e5a3a7f872
commit
0fcbd36948
2 changed files with 75 additions and 30 deletions
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  1. 65
      DotSDL/Graphics/Canvas.cs
  2. 40
      Samples/Sample.BasicPixels/Window.cs

65
DotSDL/Graphics/Canvas.cs
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@ -30,6 +30,45 @@ namespace DotSDL.Graphics {
SetSize(width, height);
}
/// <summary>
/// Draws an arc onto the <see cref="Canvas"/>.
/// </summary>
/// <param name="color">The color of the arc.</param>
/// <param name="center">A <see cref="Point"/> indicating the origin of the arc.</param>
/// <param name="radius">The radius of the arc, in pixels. Use negative values to create a left-facing arc.</param>
public void DrawArc(Color color, Point center, int radius) {
// TODO: Replace this with a more versatile spline function! This can only do left/right-facing arcs (which sucks).
var x = Math.Abs(radius);
var y = 0;
var err = 0;
var flip = radius < 0;
while(x >= y) {
PlotMirroredPointsY(color, center, x, y, flip);
y += 1;
if(err <= 0) {
err += 2 * y + 1;
}
if(err > 0) {
x -= 1;
err -= 2 * x + 1;
}
}
}
/// <summary>
/// Draws an arc onto the <see cref="Canvas"/>.
/// </summary>
/// <param name="color">The color of the arc.</param>
/// <param name="center">A <see cref="Point"/> indicating the origin of the arc.</param>
/// <param name="width">The radius of the arc, in pixels. Use negative values to create a left-facing arc.</param>
/// <param name="height">The radius of the arc, in pixels. Use negative values to create a left-facing arc.</param>
public void DrawArc(Color color, Point center, int width, int height) {
throw new NotImplementedException();
}
/// <summary>
/// Draws a circle onto the <see cref="Canvas"/>.
/// </summary>
@ -42,8 +81,8 @@ namespace DotSDL.Graphics {
var err = 0;
while(x >= y) {
PlotMirroredPoints(color, center, x, y);
PlotMirroredPoints(color, center, y, x);
PlotMirroredPointsQuad(color, center, x, y);
PlotMirroredPointsQuad(color, center, y, x);
y += 1;
if(err <= 0) {
@ -73,7 +112,7 @@ namespace DotSDL.Graphics {
var px = 0;
var py = 2 * rxSq * y;
PlotMirroredPoints(color, center, x, y);
PlotMirroredPointsQuad(color, center, x, y);
// Region 1
p = (int)(rySq - (rxSq * height) + (0.25 * rxSq));
@ -87,7 +126,7 @@ namespace DotSDL.Graphics {
py = py - 2 * rxSq;
p = p + rySq + px - py;
}
PlotMirroredPoints(color, center, x, y);
PlotMirroredPointsQuad(color, center, x, y);
}
// Region 2
@ -102,11 +141,25 @@ namespace DotSDL.Graphics {
px = px + 2 * rySq;
p = p + rxSq - py + px;
}
PlotMirroredPoints(color, center, x, y);
PlotMirroredPointsQuad(color, center, x, y);
}
}
private void PlotMirroredPointsY(Color color, Point center, int x, int y, bool flip) {
if(flip) {
Pixels[GetIndex(center.X - x, center.Y + y)] = color;
Pixels[GetIndex(center.X - x, center.Y - y)] = color;
Pixels[GetIndex(center.X - y, center.Y + x)] = color;
Pixels[GetIndex(center.X - y, center.Y - x)] = color;
} else {
Pixels[GetIndex(center.X + x, center.Y + y)] = color;
Pixels[GetIndex(center.X + x, center.Y - y)] = color;
Pixels[GetIndex(center.X + y, center.Y + x)] = color;
Pixels[GetIndex(center.X + y, center.Y - x)] = color;
}
}
private void PlotMirroredPoints(Color color, Point center, int rX, int rY) {
private void PlotMirroredPointsQuad(Color color, Point center, int rX, int rY) {
Pixels[GetIndex(center.X + rX, center.Y + rY)] = color;
Pixels[GetIndex(center.X + rX, center.Y - rY)] = color;
Pixels[GetIndex(center.X - rX, center.Y + rY)] = color;

40
Samples/Sample.BasicPixels/Window.cs
Unescape View File

@ -46,46 +46,38 @@ namespace DotSDL.Sample.BasicPixels {
const int offsetX = 96, offsetY = 80;
DrawBackground(ref canvas.Pixels);
var color = RandomColor(min, max);
// D
canvas.DrawLines(RandomColor(min, max),
new Line { Start = new Point { X = offsetX, Y = offsetY + 96 }, End = new Point { X = offsetX, Y = offsetY } },
new Line { Start = new Point { X = offsetX, Y = offsetY }, End = new Point { X = offsetX + 32, Y = offsetY } },
new Line { Start = new Point { X = offsetX + 32, Y = offsetY }, End = new Point { X = offsetX + 48, Y = offsetY + 16 } },
new Line { Start = new Point { X = offsetX + 48, Y = offsetY + 16 }, End = new Point { X = offsetX + 48, Y = offsetY + 80 } },
new Line { Start = new Point { X = offsetX + 48, Y = offsetY + 80 }, End = new Point { X = offsetX + 32, Y = offsetY + 96 } },
new Line { Start = new Point { X = offsetX + 32, Y = offsetY + 96 }, End = new Point { X = offsetX, Y = offsetY + 96 } }
canvas.DrawLines(color,
new Line { Start = new Point { X = offsetX, Y = offsetY + 96 }, End = new Point { X = offsetX, Y = offsetY }},
new Line { Start = new Point { X = offsetX, Y = offsetY }, End = new Point { X = offsetX + 24, Y = offsetY }},
new Line { Start = new Point { X = offsetX, Y = offsetY + 96 }, End = new Point { X = offsetX + 24, Y = offsetY + 96 }}
);
canvas.DrawArc(color, new Point { X = offsetX + 24, Y = offsetY + 48 }, 48);
// o
canvas.DrawEllipse(RandomColor(min, max), new Point { X = offsetX + 76, Y = offsetY + 72 }, 12, 24);
canvas.DrawEllipse(color, new Point { X = offsetX + 76, Y = offsetY + 72 }, 12, 24);
// t
canvas.DrawLines(RandomColor(min, max),
canvas.DrawLines(color,
new Line { Start = new Point { X = offsetX + 104 + 12, Y = offsetY + 24}, End = new Point { X = offsetX + 104 + 12, Y = offsetY + 96 } },
new Line { Start = new Point { X = offsetX + 104, Y = offsetY + 48}, End = new Point { X = offsetX + 104 + 24, Y = offsetY + 48 } }
);
// S
canvas.DrawLines(RandomColor(min, max),
new Line { Start = new Point { X = offsetX + 144 + 48, Y = offsetY }, End = new Point { X = offsetX + 144, Y = offsetY } },
new Line { Start = new Point { X = offsetX + 144, Y = offsetY }, End = new Point { X = offsetX + 144, Y = offsetY + 48 } },
new Line { Start = new Point { X = offsetX + 144, Y = offsetY + 48 }, End = new Point { X = offsetX + 144 + 48 , Y = offsetY + 48 } },
new Line { Start = new Point { X = offsetX + 144 + 48, Y = offsetY + 48 }, End = new Point { X = offsetX + 144 + 48 , Y = offsetY + 96 } },
new Line { Start = new Point { X = offsetX + 144 + 48, Y = offsetY + 96 }, End = new Point { X = offsetX + 144, Y = offsetY + 96 } }
canvas.DrawLines(color,
new Line { Start = new Point { X = offsetX + 144 + 24, Y = offsetY }, End = new Point { X = offsetX + 144 + 48, Y = offsetY } },
new Line { Start = new Point { X = offsetX + 144, Y = offsetY + 96 }, End = new Point { X = offsetX + 144 + 24, Y = offsetY + 96 } }
);
canvas.DrawArc(color, new Point { X = offsetX + 144 + 24, Y = offsetY + 24 }, -24);
canvas.DrawArc(color, new Point { X = offsetX + 144 + 24, Y = offsetY + 72 }, 24);
// D
canvas.DrawLines(RandomColor(min, max),
new Line { Start = new Point { X = offsetX + 208, Y = offsetY + 96 }, End = new Point { X = offsetX + 208, Y = offsetY } },
new Line { Start = new Point { X = offsetX + 208, Y = offsetY }, End = new Point { X = offsetX + 208 + 32, Y = offsetY } },
new Line { Start = new Point { X = offsetX + 208 + 32, Y = offsetY }, End = new Point { X = offsetX + 208 + 48, Y = offsetY + 16 } },
new Line { Start = new Point { X = offsetX + 208 + 48, Y = offsetY + 16 }, End = new Point { X = offsetX + 208 + 48, Y = offsetY + 80 } },
new Line { Start = new Point { X = offsetX + 208 + 48, Y = offsetY + 80 }, End = new Point { X = offsetX + 208 + 32, Y = offsetY + 96 } },
new Line { Start = new Point { X = offsetX + 208 + 32, Y = offsetY + 96 }, End = new Point { X = offsetX + 208, Y = offsetY + 96 } }
);
canvas.DrawLine(color, new Line { Start = new Point { X = offsetX + 208, Y = offsetY + 96 }, End = new Point { X = offsetX + 208, Y = offsetY } });
canvas.DrawArc(color, new Point { X = offsetX + 208, Y = offsetY + 48 }, 48);
// L
canvas.DrawLines(RandomColor(min, max),
canvas.DrawLines(color,
new Line { Start = new Point { X = offsetX + 272, Y = offsetY }, End = new Point { X = offsetX + 272, Y = offsetY + 96} },
new Line { Start = new Point { X = offsetX + 272, Y = offsetY + 96 }, End = new Point { X = offsetX + 272 + 48, Y = offsetY + 96} }
);

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