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ShadersScene.java
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ShadersScene.java
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package org.jetbrains.skija.examples.lwjgl;
import org.jetbrains.skija.*;
public class ShadersScene implements Scene {
@Override
public void draw(Canvas canvas, int width, int height, float dpi, int xpos, int ypos) {
canvas.translate(20, 20);
drawColors(canvas);
drawShaders(canvas);
drawGradients(canvas);
drawLinearCS(canvas);
drawBlending(canvas);
}
private void drawColors(Canvas canvas) {
canvas.save();
try (Paint fill = new Paint()) {
fill.setColor(0xFFFF0000);
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
fill.setColor(0xFF00FF00);
canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
fill.setColor(0xFF0000FF);
canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
canvas.translate(70, 0);
fill.setColor4f(new Color4f(1, 0, 0, 1));
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
fill.setColor4f(new Color4f(0, 1, 0, 1));
canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
fill.setColor4f(new Color4f(0, 0, 1, 1));
canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
canvas.translate(70, 0);
fill.setColor4f(new Color4f(1, 0, 0, 1), ColorSpace.getSRGB());
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
fill.setColor4f(new Color4f(0, 1, 0, 1), ColorSpace.getSRGB());
canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
fill.setColor4f(new Color4f(0, 0, 1, 1), ColorSpace.getSRGB());
canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
canvas.translate(70, 0);
fill.setColor4f(new Color4f(1, 0, 0, 1), ColorSpace.getDisplayP3());
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 20), fill);
fill.setColor4f(new Color4f(0, 1, 0, 1), ColorSpace.getDisplayP3());
canvas.drawRect(Rect.makeXYWH(0, 20, 60, 20), fill);
fill.setColor4f(new Color4f(0, 0, 1, 1), ColorSpace.getDisplayP3());
canvas.drawRect(Rect.makeXYWH(0, 40, 60, 20), fill);
canvas.translate(70, 0);
}
canvas.restore();
canvas.translate(0, 70);
}
private void drawShaders(Canvas canvas) {
canvas.save();
float percent = Math.abs((System.currentTimeMillis() % 3000) / 10f - 150f) - 25f;
percent = Math.round(Math.max(0f, Math.min(100f, percent)));
Shader[] shaders = new Shader[] {
Shader.makeEmpty(),
Shader.makeColor(0xFF247ba0),
Shader.makeColor(new Color4f(0.5f, 0.5f, 0.5f), ColorSpace.getSRGBLinear()),
Shader.makeLerp(percent / 100f, Shader.makeColor(0xFFFF0000), Shader.makeColor(0xFF00FF00)),
Shader.makeBlend(BlendMode.SRC_OVER, Shader.makeColor(0xFFFF0000), Shader.makeColor(0x9000FF00)),
Shader.makeBlend(BlendMode.SCREEN, Shader.makeColor(0xFFFF0000), Shader.makeColor(0x9000FF00)),
Shader.makeBlend(BlendMode.OVERLAY, Shader.makeColor(0xFFFF0000), Shader.makeColor(0x9000FF00)),
Shader.makeBlend(BlendMode.DARKEN, Shader.makeColor(0xFFFF0000), Shader.makeColor(0x9000FF00)),
Shader.makeBlend(BlendMode.LIGHTEN, Shader.makeColor(0xFFFF0000), Shader.makeColor(0x9000FF00)),
Shader.makeLinearGradient(0, 0, 60, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }).makeWithColorFilter(ColorFilter.makeBlend(0xFFCC3333, BlendMode.SCREEN)),
};
try (Paint fill = new Paint()) {
for (Shader sh: shaders) {
fill.setShader(sh);
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 60), fill);
canvas.translate(70, 0);
sh.close();
}
}
canvas.restore();
canvas.translate(0, 70);
}
private void drawGradients(Canvas canvas) {
canvas.save();
Shader[] shaders = new Shader[] {
Shader.makeLinearGradient( 0, 0, 60, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeLinearGradient(20, 0, 40, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeLinearGradient(20, 0, 40, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }, null, GradientStyle.DEFAULT.withTileMode(FilterTileMode.REPEAT)),
Shader.makeLinearGradient(20, 0, 40, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }, null, GradientStyle.DEFAULT.withTileMode(FilterTileMode.MIRROR)),
Shader.makeLinearGradient(20, 0, 40, 0, new int[] { 0xFF247ba0, 0xFFf3ffbd }, null, GradientStyle.DEFAULT.withTileMode(FilterTileMode.DECAL)),
Shader.makeLinearGradient( 0, 0, 0, 60, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeLinearGradient( 0, 0, 0, 60, new int[] { 0xFF247ba0, 0xFFf3ffbd }, null, GradientStyle.DEFAULT.withLocalMatrix(Matrix33.makeRotate(45))),
Shader.makeLinearGradient( 0, 0, 60, 60, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeLinearGradient( 0, 0, 60, 0, new int[] { 0xFF247ba0, 0x00000000 }),
Shader.makeLinearGradient( 0, 0, 60, 0, new int[] { 0xFF247ba0, 0xFFff1654, 0xFF70c1b3, 0xFFf3ffbd, 0xFFb2dbbf }),
Shader.makeLinearGradient( 0, 0, 60, 0, new int[] { 0xFF247ba0, 0xFFff1654, 0xFF70c1b3, 0xFFf3ffbd, 0xFFb2dbbf }, new float[] {0f, 0.1f, 0.2f, 0.9f, 1f}),
Shader.makeRadialGradient(30, 30, 30, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeRadialGradient(30, 30, 10, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeRadialGradient(30, 30, 10, new int[] { 0xFF247ba0, 0xFFf3ffbd }, null, GradientStyle.DEFAULT.withTileMode(FilterTileMode.REPEAT)),
Shader.makeTwoPointConicalGradient(20, 20, 10, 40, 40, 40, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeSweepGradient(30, 30, new int[] { 0xFF247ba0, 0xFFf3ffbd }),
Shader.makeSweepGradient(30, 30, 45, 315, new int[] { 0xFF247ba0, 0xFFff1654, 0xFF70c1b3, 0xFFf3ffbd, 0xFFb2dbbf }, null, GradientStyle.DEFAULT.withTileMode(FilterTileMode.DECAL)),
};
try (Paint fill = new Paint()) {
for (Shader sh: shaders) {
fill.setShader(sh);
canvas.drawRect(Rect.makeXYWH(0, 0, 60, 60), fill);
canvas.translate(70, 0);
sh.close();
}
}
try (var sh = Shader.makeSweepGradient(30, 30, new int[] { 0xFFFF00FF, 0xFF00FFFF, 0xFFFFFF00, 0xFFFF00FF });
var stroke = new Paint().setShader(sh).setMode(PaintMode.STROKE).setStrokeWidth(10))
{
canvas.drawCircle(30, 30, 30, stroke);
canvas.translate(70, 0);
}
try (Path p1 = new Path().lineTo(30.1f, 0).lineTo(0, 32.5f).closePath();
Shader s1 = Shader.makeLinearGradient(0, 32.5f, 30.1f, 0,
new int[] {0xFF0095D5, 0xFF3C83DC, 0xFF6D74E1, 0xFF806EE3},
new float[] {0.1183f, 0.4178f, 0.6962f, 0.8333f});
Paint f1 = new Paint().setShader(s1);
Path p2 = new Path().moveTo(30.1f, 0).lineTo(0, 31.7f).lineTo(0, 60).lineTo(30.1f, 29.9f).lineTo(60, 0).closePath();
Shader s2 = Shader.makeLinearGradient(0, 60, 60, 0,
new int[] {0xFFC757BC, 0xFFD0609A, 0xFFE1725C, 0xFFEE7E2F, 0xFFF58613, 0xFFF88909},
new float[] {0.1075f, 0.2138f, 0.4254f, 0.6048f, 0.743f, 0.8232f});
Paint f2 = new Paint().setShader(s2);
Path p3 = new Path().moveTo(0, 60).lineTo(30.1f, 29.9f).lineTo(60, 60).closePath();
Shader s3 = Shader.makeLinearGradient(0, 60, 30.1f, 29.9f,
new int[] { 0xFF0095D5, 0xFF238AD9, 0xFF557BDE, 0xFF7472E2, 0xFF806EE3 },
new float[] {0f, 0.3f, 0.62f, 0.8643f, 1f});
Paint f3 = new Paint().setShader(s3);)
{
canvas.drawPath(p1, f1);
canvas.drawPath(p2, f2);
canvas.drawPath(p3, f3);
canvas.translate(70, 0);
}
canvas.restore();
canvas.translate(0, 70);
}
private Shader linearCS(float x0, float y0, float x1, float y1, int colorFrom, int colorTo, ColorSpace cs, int steps) {
Color4f from = ColorSpace.getSRGB().convert(cs, new Color4f(colorFrom));
Color4f to = ColorSpace.getSRGB().convert(cs, new Color4f(colorTo));
Color4f[] colors = new Color4f[steps + 1];
float[] pos = new float[steps + 1];
for (int i = 0; i < steps + 1; ++i) {
pos[i] = (float) i / steps;
colors[i] = from.makeLerp(to, pos[i]);
}
return Shader.makeLinearGradient(x0, y0, x1, y1, colors, cs, pos, GradientStyle.DEFAULT);
}
private void drawLinearCS(Canvas canvas) {
for (ColorSpace cs: new ColorSpace[] {null, ColorSpace.getSRGB(), ColorSpace.getSRGBLinear()}) {
canvas.save();
int[][] colors = new int[][] {
new int[] {0xFFFF0000, 0xFF00FF00},
new int[] {0xFFFF0000, 0xFF0000FF},
new int[] {0xFFFF0000, 0xFF00FFFF},
new int[] {0xFF0000FF, 0xFF00FF00},
new int[] {0xFF00FFFF, 0xFFFF00FF},
new int[] {0xFF00FF00, 0xFFFF00FF},
new int[] {0xFF000000, 0xFFFFFFFF},
new int[] {0xFF555555, 0xFFAAAAAA},
};
try (Paint fill = new Paint()) {
for (int[] pair: colors) {
try (var shader = linearCS(31, 0, 129, 0, pair[0], pair[1], cs, 10)) {
fill.setColor(pair[0]);
canvas.drawRect(Rect.makeXYWH(0, 0, 30, 30), fill);
fill.setShader(shader);
canvas.drawRect(Rect.makeXYWH(31, 0, 98, 30), fill);
fill.setShader(null);
fill.setColor(pair[1]);
canvas.drawRect(Rect.makeXYWH(130, 0, 30, 30), fill);
canvas.translate(170, 0);
}
}
}
canvas.restore();
canvas.translate(0, 40);
}
}
private void drawBlending(Canvas canvas) {
int pink = 0xFFFF0080;
int purple = 0xFF8000FF;
int orange = 0xFFFFA500;
int transparentBlack = 0x00000000;
try (Paint fill = new Paint();
Shader gr1 = Shader.makeLinearGradient(0, 0, 0, 100, new int[] {pink, purple});
Shader gr2 = Shader.makeLinearGradient(0, 0, 400, 0, new int[] {orange, transparentBlack});
Shader gr3 = Shader.makeLinearGradient(0, 0, 400, 0, new int[] {orange, transparentBlack}, null, GradientStyle.DEFAULT.withPremul(false));
Shader gr4 = Shader.makeBlend(BlendMode.SRC_OVER, gr1, gr2);)
{
canvas.save();
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setColor(pink));
canvas.translate(90, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 400, 80), fill.setShader(gr1));
canvas.translate(410, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setShader(null).setColor(purple));
canvas.restore();
canvas.translate(0, 90);
canvas.save();
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setColor(orange));
canvas.translate(90, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 400, 80), fill.setShader(gr2));
canvas.translate(410, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setShader(null).setColor(transparentBlack));
canvas.restore();
canvas.translate(0, 90);
canvas.save();
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setColor(orange));
canvas.translate(90, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 400, 80), fill.setShader(gr3));
canvas.translate(410, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setShader(null).setColor(transparentBlack));
canvas.restore();
canvas.translate(0, 90);
canvas.save();
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setColor(orange));
canvas.translate(90, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 400, 80), fill.setShader(gr4));
canvas.translate(410, 0);
canvas.drawRect(Rect.makeXYWH(0, 0, 80, 80), fill.setShader(gr1));
canvas.restore();
}
}
}