import { LinearGradientObject } from '../graphic/LinearGradient';
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import { RadialGradientObject } from '../graphic/RadialGradient';
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import { GradientObject } from '../graphic/Gradient';
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import { RectLike } from '../core/BoundingRect';
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import Path from '../graphic/Path';
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function isSafeNum(num: number) {
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// NaN、Infinity、undefined、'xx'
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return isFinite(num);
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}
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export function createLinearGradient(
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this: void,
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ctx: CanvasRenderingContext2D,
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obj: LinearGradientObject,
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rect: RectLike
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) {
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let x = obj.x == null ? 0 : obj.x;
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let x2 = obj.x2 == null ? 1 : obj.x2;
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let y = obj.y == null ? 0 : obj.y;
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let y2 = obj.y2 == null ? 0 : obj.y2;
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if (!obj.global) {
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x = x * rect.width + rect.x;
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x2 = x2 * rect.width + rect.x;
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y = y * rect.height + rect.y;
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y2 = y2 * rect.height + rect.y;
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}
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// Fix NaN when rect is Infinity
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x = isSafeNum(x) ? x : 0;
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x2 = isSafeNum(x2) ? x2 : 1;
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y = isSafeNum(y) ? y : 0;
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y2 = isSafeNum(y2) ? y2 : 0;
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const canvasGradient = ctx.createLinearGradient(x, y, x2, y2);
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return canvasGradient;
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}
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export function createRadialGradient(
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this: void,
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ctx: CanvasRenderingContext2D,
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obj: RadialGradientObject,
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rect: RectLike
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) {
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const width = rect.width;
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const height = rect.height;
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const min = Math.min(width, height);
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let x = obj.x == null ? 0.5 : obj.x;
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let y = obj.y == null ? 0.5 : obj.y;
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let r = obj.r == null ? 0.5 : obj.r;
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if (!obj.global) {
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x = x * width + rect.x;
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y = y * height + rect.y;
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r = r * min;
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}
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x = isSafeNum(x) ? x : 0.5;
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y = isSafeNum(y) ? y : 0.5;
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r = r >= 0 && isSafeNum(r) ? r : 0.5;
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const canvasGradient = ctx.createRadialGradient(x, y, 0, x, y, r);
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return canvasGradient;
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}
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export function getCanvasGradient(this: void, ctx: CanvasRenderingContext2D, obj: GradientObject, rect: RectLike) {
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// TODO Cache?
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const canvasGradient = obj.type === 'radial'
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? createRadialGradient(ctx, obj as RadialGradientObject, rect)
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: createLinearGradient(ctx, obj as LinearGradientObject, rect);
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const colorStops = obj.colorStops;
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for (let i = 0; i < colorStops.length; i++) {
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canvasGradient.addColorStop(
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colorStops[i].offset, colorStops[i].color
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);
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}
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return canvasGradient;
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}
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export function isClipPathChanged(clipPaths: Path[], prevClipPaths: Path[]): boolean {
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// displayable.__clipPaths can only be `null`/`undefined` or an non-empty array.
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if (clipPaths === prevClipPaths || (!clipPaths && !prevClipPaths)) {
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return false;
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}
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if (!clipPaths || !prevClipPaths || (clipPaths.length !== prevClipPaths.length)) {
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return true;
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}
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for (let i = 0; i < clipPaths.length; i++) {
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if (clipPaths[i] !== prevClipPaths[i]) {
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return true;
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}
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}
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return false;
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}
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function parseInt10(val: string) {
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return parseInt(val, 10);
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}
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export function getSize(
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root: HTMLElement,
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whIdx: number,
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opts: { width?: number | string, height?: number | string}
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) {
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const wh = ['width', 'height'][whIdx] as 'width' | 'height';
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const cwh = ['clientWidth', 'clientHeight'][whIdx] as 'clientWidth' | 'clientHeight';
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const plt = ['paddingLeft', 'paddingTop'][whIdx] as 'paddingLeft' | 'paddingTop';
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const prb = ['paddingRight', 'paddingBottom'][whIdx] as 'paddingRight' | 'paddingBottom';
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if (opts[wh] != null && opts[wh] !== 'auto') {
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return parseFloat(opts[wh] as string);
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}
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// IE8 does not support getComputedStyle, but it use VML.
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const stl = document.defaultView.getComputedStyle(root);
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return (
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(root[cwh] || parseInt10(stl[wh]) || parseInt10(root.style[wh]))
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- (parseInt10(stl[plt]) || 0)
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- (parseInt10(stl[prb]) || 0)
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) | 0;
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}
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