import { Texture } from '@pixi/core';
import { SHAPES, Matrix } from '@pixi/math';
import { canvasUtils } from '@pixi/canvas-renderer';
import type { CanvasRenderer } from '@pixi/canvas-renderer';
import type { FillStyle, Graphics } from '@pixi/graphics';
import type { Polygon, Rectangle, Circle, Ellipse, RoundedRectangle } from '@pixi/math';
/*
* @author Mat Groves
*
* Big thanks to the very clever Matt DesLauriers <mattdesl> https://github.com/mattdesl/
* for creating the original PixiJS version!
* Also a thanks to https://github.com/bchevalier for tweaking the tint and alpha so that they
* now share 4 bytes on the vertex buffer
*
* Heavily inspired by LibGDX's CanvasGraphicsRenderer:
* https://github.com/libgdx/libgdx/blob/1.0.0/gdx/src/com/badlogic/gdx/graphics/glutils/ShapeRenderer.java
*/
/**
* Renderer dedicated to drawing and batching graphics objects.
*
* @class
* @protected
* @memberof PIXI
*/
export class CanvasGraphicsRenderer
{
public renderer: CanvasRenderer;
private _svgMatrix: DOMMatrix|boolean;
private _tempMatrix: Matrix;
/**
* @param {PIXI.CanvasRenderer} renderer - The current PIXI renderer.
*/
constructor(renderer: CanvasRenderer)
{
this.renderer = renderer;
this._svgMatrix = null;
this._tempMatrix = new Matrix();
}
/**
* calculates fill/stroke style for canvas
*
* @private
* @param {PIXI.FillStyle} style
* @param {number} tint
* @returns {string|CanvasPattern}
*/
private _calcCanvasStyle(style: FillStyle, tint: number): string|CanvasPattern
{
let res;
if (style.texture && style.texture.baseTexture !== Texture.WHITE.baseTexture)
{
if (style.texture.valid)
{
res = canvasUtils.getTintedPattern(style.texture, tint);
this.setPatternTransform(res, style.matrix || Matrix.IDENTITY);
}
else
{
res = '#808080';
}
}
else
{
res = `#${(`00000${(tint | 0).toString(16)}`).substr(-6)}`;
}
return res;
}
/**
* Renders a Graphics object to a canvas.
*
* @param {PIXI.Graphics} graphics - the actual graphics object to render
*/
public render(graphics: Graphics): void
{
const renderer = this.renderer;
const context = renderer.context;
const worldAlpha = graphics.worldAlpha;
const transform = graphics.transform.worldTransform;
renderer.setContextTransform(transform);
renderer.setBlendMode(graphics.blendMode);
const graphicsData = graphics.geometry.graphicsData;
let contextFillStyle;
let contextStrokeStyle;
const tintR = ((graphics.tint >> 16) & 0xFF) / 255;
const tintG = ((graphics.tint >> 8) & 0xFF) / 255;
const tintB = (graphics.tint & 0xFF) / 255;
for (let i = 0; i < graphicsData.length; i++)
{
const data = graphicsData[i];
const shape = data.shape;
const fillStyle = data.fillStyle;
const lineStyle = data.lineStyle;
const fillColor = data.fillStyle.color | 0;
const lineColor = data.lineStyle.color | 0;
if (data.matrix)
{
renderer.setContextTransform(transform.copyTo(this._tempMatrix).append(data.matrix));
}
if (fillStyle.visible)
{
const fillTint = (
(((fillColor >> 16) & 0xFF) / 255 * tintR * 255 << 16)
+ (((fillColor >> 8) & 0xFF) / 255 * tintG * 255 << 8)
+ (((fillColor & 0xFF) / 255) * tintB * 255)
);
contextFillStyle = this._calcCanvasStyle(fillStyle, fillTint);
}
if (lineStyle.visible)
{
const lineTint = (
(((lineColor >> 16) & 0xFF) / 255 * tintR * 255 << 16)
+ (((lineColor >> 8) & 0xFF) / 255 * tintG * 255 << 8)
+ (((lineColor & 0xFF) / 255) * tintB * 255)
);
contextStrokeStyle = this._calcCanvasStyle(lineStyle, lineTint);
}
context.lineWidth = lineStyle.width;
context.lineCap = lineStyle.cap;
context.lineJoin = lineStyle.join;
context.miterLimit = lineStyle.miterLimit;
if (data.type === SHAPES.POLY)
{
context.beginPath();
const tempShape = shape as Polygon;
let points = tempShape.points;
const holes = data.holes;
let outerArea;
let innerArea;
let px;
let py;
context.moveTo(points[0], points[1]);
for (let j = 2; j < points.length; j += 2)
{
context.lineTo(points[j], points[j + 1]);
}
if (tempShape.closeStroke)
{
context.closePath();
}
if (holes.length > 0)
{
outerArea = 0;
px = points[0];
py = points[1];
for (let j = 2; j + 2 < points.length; j += 2)
{
outerArea += ((points[j] - px) * (points[j + 3] - py))
- ((points[j + 2] - px) * (points[j + 1] - py));
}
for (let k = 0; k < holes.length; k++)
{
points = (holes[k].shape as Polygon).points;
if (!points)
{
continue;
}
innerArea = 0;
px = points[0];
py = points[1];
for (let j = 2; j + 2 < points.length; j += 2)
{
innerArea += ((points[j] - px) * (points[j + 3] - py))
- ((points[j + 2] - px) * (points[j + 1] - py));
}
if (innerArea * outerArea < 0)
{
context.moveTo(points[0], points[1]);
for (let j = 2; j < points.length; j += 2)
{
context.lineTo(points[j], points[j + 1]);
}
}
else
{
context.moveTo(points[points.length - 2], points[points.length - 1]);
for (let j = points.length - 4; j >= 0; j -= 2)
{
context.lineTo(points[j], points[j + 1]);
}
}
if ((holes[k].shape as Polygon).closeStroke)
{
context.closePath();
}
}
}
if (fillStyle.visible)
{
context.globalAlpha = fillStyle.alpha * worldAlpha;
context.fillStyle = contextFillStyle;
context.fill();
}
if (lineStyle.visible)
{
context.globalAlpha = lineStyle.alpha * worldAlpha;
context.strokeStyle = contextStrokeStyle;
context.stroke();
}
}
else if (data.type === SHAPES.RECT)
{
const tempShape = shape as Rectangle;
if (fillStyle.visible)
{
context.globalAlpha = fillStyle.alpha * worldAlpha;
context.fillStyle = contextFillStyle;
context.fillRect(tempShape.x, tempShape.y, tempShape.width, tempShape.height);
}
if (lineStyle.visible)
{
context.globalAlpha = lineStyle.alpha * worldAlpha;
context.strokeStyle = contextStrokeStyle;
context.strokeRect(tempShape.x, tempShape.y, tempShape.width, tempShape.height);
}
}
else if (data.type === SHAPES.CIRC)
{
const tempShape = shape as Circle;
// TODO - need to be Undefined!
context.beginPath();
context.arc(tempShape.x, tempShape.y, tempShape.radius, 0, 2 * Math.PI);
context.closePath();
if (fillStyle.visible)
{
context.globalAlpha = fillStyle.alpha * worldAlpha;
context.fillStyle = contextFillStyle;
context.fill();
}
if (lineStyle.visible)
{
context.globalAlpha = lineStyle.alpha * worldAlpha;
context.strokeStyle = contextStrokeStyle;
context.stroke();
}
}
else if (data.type === SHAPES.ELIP)
{
// ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
const tempShape = shape as Ellipse;
const w = tempShape.width * 2;
const h = tempShape.height * 2;
const x = tempShape.x - (w / 2);
const y = tempShape.y - (h / 2);
context.beginPath();
const kappa = 0.5522848;
const ox = (w / 2) * kappa; // control point offset horizontal
const oy = (h / 2) * kappa; // control point offset vertical
const xe = x + w; // x-end
const ye = y + h; // y-end
const xm = x + (w / 2); // x-middle
const ym = y + (h / 2); // y-middle
context.moveTo(x, ym);
context.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
context.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
context.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
context.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
context.closePath();
if (fillStyle.visible)
{
context.globalAlpha = fillStyle.alpha * worldAlpha;
context.fillStyle = contextFillStyle;
context.fill();
}
if (lineStyle.visible)
{
context.globalAlpha = lineStyle.alpha * worldAlpha;
context.strokeStyle = contextStrokeStyle;
context.stroke();
}
}
else if (data.type === SHAPES.RREC)
{
const tempShape = shape as RoundedRectangle;
const rx = tempShape.x;
const ry = tempShape.y;
const width = tempShape.width;
const height = tempShape.height;
let radius = tempShape.radius;
const maxRadius = Math.min(width, height) / 2 | 0;
radius = radius > maxRadius ? maxRadius : radius;
context.beginPath();
context.moveTo(rx, ry + radius);
context.lineTo(rx, ry + height - radius);
context.quadraticCurveTo(rx, ry + height, rx + radius, ry + height);
context.lineTo(rx + width - radius, ry + height);
context.quadraticCurveTo(rx + width, ry + height, rx + width, ry + height - radius);
context.lineTo(rx + width, ry + radius);
context.quadraticCurveTo(rx + width, ry, rx + width - radius, ry);
context.lineTo(rx + radius, ry);
context.quadraticCurveTo(rx, ry, rx, ry + radius);
context.closePath();
if (fillStyle.visible)
{
context.globalAlpha = fillStyle.alpha * worldAlpha;
context.fillStyle = contextFillStyle;
context.fill();
}
if (lineStyle.visible)
{
context.globalAlpha = lineStyle.alpha * worldAlpha;
context.strokeStyle = contextStrokeStyle;
context.stroke();
}
}
}
}
public setPatternTransform(pattern: CanvasPattern, matrix: Matrix): void
{
if (this._svgMatrix === false)
{
return;
}
if (!this._svgMatrix)
{
const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
if (svg && svg.createSVGMatrix)
{
this._svgMatrix = svg.createSVGMatrix();
}
if (!this._svgMatrix || !pattern.setTransform)
{
this._svgMatrix = false;
return;
}
}
(this._svgMatrix as DOMMatrix).a = matrix.a;
(this._svgMatrix as DOMMatrix).b = matrix.b;
(this._svgMatrix as DOMMatrix).c = matrix.c;
(this._svgMatrix as DOMMatrix).d = matrix.d;
(this._svgMatrix as DOMMatrix).e = matrix.tx;
(this._svgMatrix as DOMMatrix).f = matrix.ty;
pattern.setTransform((this._svgMatrix as DOMMatrix).inverse());
}
/**
* destroy graphics object
*
*/
public destroy(): void
{
this.renderer = null;
this._svgMatrix = null;
this._tempMatrix = null;
}
}