const CONST = require('../../../../const');
/**
* A set of functions used by the canvas renderer to draw the primitive graphics data.
* @static
* @class
*/
const CanvasGraphics = {};
/*
* Renders a Graphics object to a canvas.
*
* @param graphics {Graphics} the actual graphics object to render
* @param context {CanvasRenderingContext2D} the 2d drawing method of the canvas
*/
CanvasGraphics.renderGraphics = function(graphics, context) {
var worldAlpha = graphics.worldAlpha;
if (graphics.dirty) {
this.updateGraphicsTint(graphics);
graphics.dirty = false;
}
for (var i = 0; i < graphics.graphicsData.length; i++) {
var data = graphics.graphicsData[i];
var shape = data.shape;
var fillColor = data._fillTint;
var lineColor = data._lineTint;
context.lineWidth = data.lineWidth;
if (data.type === CONST.SHAPES.POLY) {
context.beginPath();
var points = shape.points;
context.moveTo(points[0], points[1]);
for (var j = 1; j < points.length / 2; j++) {
context.lineTo(points[j * 2], points[j * 2 + 1]);
}
if (shape.closed) {
context.lineTo(points[0], points[1]);
}
// if the first and last point are the same close the path - much neater :)
if (points[0] === points[points.length - 2] && points[1] === points[points.length - 1]) {
context.closePath();
}
if (data.fill) {
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + (fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth) {
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + (lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
else if (data.type === CONST.SHAPES.RECT) {
if (data.fillColor || data.fillColor === 0) {
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + (fillColor | 0).toString(16)).substr(-6);
context.fillRect(shape.x, shape.y, shape.width, shape.height);
}
if (data.lineWidth) {
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + (lineColor | 0).toString(16)).substr(-6);
context.strokeRect(shape.x, shape.y, shape.width, shape.height);
}
}
else if (data.type === CONST.SHAPES.CIRC) {
// TODO - need to be Undefined!
context.beginPath();
context.arc(shape.x, shape.y, shape.radius,0,2 * Math.PI);
context.closePath();
if (data.fill) {
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + (fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth) {
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + (lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
else if (data.type === CONST.SHAPES.ELIP) {
// ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var w = shape.width * 2;
var h = shape.height * 2;
var x = shape.x - w / 2;
var y = shape.y - h / 2;
context.beginPath();
var kappa = 0.5522848,
ox = (w / 2) * kappa, // control point offset horizontal
oy = (h / 2) * kappa, // control point offset vertical
xe = x + w, // x-end
ye = y + h, // y-end
xm = x + w / 2, // x-middle
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 (data.fill) {
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + (fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth) {
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + (lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
else if (data.type === CONST.SHAPES.RREC) {
var rx = shape.x;
var ry = shape.y;
var width = shape.width;
var height = shape.height;
var radius = shape.radius;
var 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 (data.fillColor || data.fillColor === 0) {
context.globalAlpha = data.fillAlpha * worldAlpha;
context.fillStyle = '#' + ('00000' + (fillColor | 0).toString(16)).substr(-6);
context.fill();
}
if (data.lineWidth) {
context.globalAlpha = data.lineAlpha * worldAlpha;
context.strokeStyle = '#' + ('00000' + (lineColor | 0).toString(16)).substr(-6);
context.stroke();
}
}
}
};
/*
* Renders a graphics mask
*
* @private
* @param graphics {PIXI.Graphics} the graphics which will be used as a mask
* @param context {CanvasRenderingContext2D} the context 2d method of the canvas
*/
CanvasGraphics.renderGraphicsMask = function(graphics, context) {
var len = graphics.graphicsData.length;
if (len === 0) {
return;
}
context.beginPath();
for (var i = 0; i < len; i++) {
var data = graphics.graphicsData[i];
var shape = data.shape;
if (data.type === CONST.SHAPES.POLY) {
var points = shape.points;
context.moveTo(points[0], points[1]);
for (var j = 1; j < points.length / 2; j++) {
context.lineTo(points[j * 2], points[j * 2 + 1]);
}
// if the first and last point are the same close the path - much neater :)
if (points[0] === points[points.length - 2] && points[1] === points[points.length - 1]) {
context.closePath();
}
}
else if (data.type === CONST.SHAPES.RECT) {
context.rect(shape.x, shape.y, shape.width, shape.height);
context.closePath();
}
else if (data.type === CONST.SHAPES.CIRC) {
// TODO - need to be Undefined!
context.arc(shape.x, shape.y, shape.radius, 0, 2 * Math.PI);
context.closePath();
}
else if (data.type === CONST.SHAPES.ELIP) {
// ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
var w = shape.width * 2;
var h = shape.height * 2;
var x = shape.x - w / 2;
var y = shape.y - h / 2;
var kappa = 0.5522848,
ox = (w / 2) * kappa, // control point offset horizontal
oy = (h / 2) * kappa, // control point offset vertical
xe = x + w, // x-end
ye = y + h, // y-end
xm = x + w / 2, // x-middle
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();
}
else if (data.type === CONST.SHAPES.RREC) {
var rx = shape.x;
var ry = shape.y;
var width = shape.width;
var height = shape.height;
var radius = shape.radius;
var maxRadius = Math.min(width, height) / 2 | 0;
radius = radius > maxRadius ? maxRadius : radius;
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();
}
}
};
/*
* Updates the tint of a graphics object
*
* @private
* @param graphics {PIXI.Graphics} the graphics that will have its tint updated
*
*/
CanvasGraphics.updateGraphicsTint = function(graphics) {
if (graphics.tint === 0xFFFFFF && graphics._prevTint === graphics.tint) {
return;
}
graphics._prevTint = graphics.tint;
var tintR = (graphics.tint >> 16 & 0xFF) / 255;
var tintG = (graphics.tint >> 8 & 0xFF) / 255;
var tintB = (graphics.tint & 0xFF) / 255;
for (var i = 0; i < graphics.graphicsData.length; i++) {
var data = graphics.graphicsData[i];
var fillColor = data.fillColor | 0;
var lineColor = data.lineColor | 0;
/*
var colorR = (fillColor >> 16 & 0xFF) / 255;
var colorG = (fillColor >> 8 & 0xFF) / 255;
var colorB = (fillColor & 0xFF) / 255;
colorR *= tintR;
colorG *= tintG;
colorB *= tintB;
fillColor = ((colorR*255 << 16) + (colorG*255 << 8) + colorB*255);
colorR = (lineColor >> 16 & 0xFF) / 255;
colorG = (lineColor >> 8 & 0xFF) / 255;
colorB = (lineColor & 0xFF) / 255;
colorR *= tintR;
colorG *= tintG;
colorB *= tintB;
lineColor = ((colorR*255 << 16) + (colorG*255 << 8) + colorB*255);
*/
// super inline cos im an optimization NAZI :)
data._fillTint = (((fillColor >> 16 & 0xFF) / 255 * tintR * 255 << 16) + ((fillColor >> 8 & 0xFF) / 255 * tintG * 255 << 8) + (fillColor & 0xFF) / 255 * tintB * 255);
data._lineTint = (((lineColor >> 16 & 0xFF) / 255 * tintR * 255 << 16) + ((lineColor >> 8 & 0xFF) / 255 * tintG * 255 << 8) + (lineColor & 0xFF) / 255 * tintB * 255);
}
};
module.exports = CanvasGraphics;