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- <template>
- <div>
- <canvas id="sourceOver" width="740" height="400" tabindex="0"/>
- </div>
- </template>
- <script>
- import {SGraphItem, SGraphScene, SGraphView} from "@persagy-web/graph/lib";
- import {SColor, SRect, SCompositeType} from "@persagy-web/draw/lib"
- class Circle extends SGraphItem{
- constructor(parent, com){
- super(parent);
- this.composite = com ? SCompositeType.SourceOver : com;
- }
- boundingRect() {
- return new SRect(-500,-500,1500,1500);
- }
- onDraw(painter) {
- painter.brush.color = SColor.Blue;
- painter.pen.color = SColor.Transparent;
- painter.drawRect(0,0,1000,1000);
- painter.composite = SCompositeType.SourceOut;
- painter.brush.color = SColor.Red;
- painter.drawCircle(0,0,500);
- painter.brush.color = SColor.Transparent;
- painter.pen.color = SColor.Black;
- painter.drawRect(-500,-500,1500,1500);
- }
- }
- export default {
- name: "sourceOver",
- data(){
- return {
- view:''
- }
- },
- mounted() {
- this.init()
- },
- methods:{
- init(){
- this.view = new SGraphView('sourceOver');
- const scene = new SGraphScene();
- const circle = new Circle(null, SCompositeType.SourceOut);
- scene.addItem(circle);
- this.view.scene = scene;
- this.view.fitSceneToView();
- this.view.scalable = false;
- },
- }
- }
- </script>
- <style scoped>
- </style>
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