konvajs

问题 I have followed the answer in this post; fill image with texture pattern, and it is working perfectly. Is there a way to do the same with KonvaJS? 回答1: AFAIK, KonvaJS does not yet support the compositing required to create your texture overlay. But a Konva.Image can take a native html5 canvas element as its image source, so just do your overlay on an html5 canvas element and then feed it to Konva: var textureImage = new Konva.Image({ image:myCanvasElement }) Example annotated code and a Demo:

问题 I have followed the answer in this post; fill image with texture pattern, and it is working perfectly. Is there a way to do the same with KonvaJS? 回答1: AFAIK, KonvaJS does not yet support the compositing required to create your texture overlay. But a Konva.Image can take a native html5 canvas element as its image source, so just do your overlay on an html5 canvas element and then feed it to Konva: var textureImage = new Konva.Image({ image:myCanvasElement }) Example annotated code and a Demo:

问题 I have seen a few cases of questions asking how to rotate a shape around a given point and decided to ask this self-answer question myself. So - in relation to HTML5 canvas, or in fact any two-dimensional surface, how can I rotate a shape around an arbitrary x,y point ? 回答1: It turns out the answer is pretty simple but involves a bit of math that may put some folks off. I'm using the Konvajs HTML5 canvas library but the code is easily transportable to your own lib. Also, this example is

问题 I have seen a few cases of questions asking how to rotate a shape around a given point and decided to ask this self-answer question myself. So - in relation to HTML5 canvas, or in fact any two-dimensional surface, how can I rotate a shape around an arbitrary x,y point ? 回答1: It turns out the answer is pretty simple but involves a bit of math that may put some folks off. I'm using the Konvajs HTML5 canvas library but the code is easily transportable to your own lib. Also, this example is

问题 I have seen a few cases of questions asking how to rotate a shape around a given point and decided to ask this self-answer question myself. So - in relation to HTML5 canvas, or in fact any two-dimensional surface, how can I rotate a shape around an arbitrary x,y point ? 回答1: It turns out the answer is pretty simple but involves a bit of math that may put some folks off. I'm using the Konvajs HTML5 canvas library but the code is easily transportable to your own lib. Also, this example is

问题 I have seen a few cases of questions asking how to rotate a shape around a given point and decided to ask this self-answer question myself. So - in relation to HTML5 canvas, or in fact any two-dimensional surface, how can I rotate a shape around an arbitrary x,y point ? 回答1: It turns out the answer is pretty simple but involves a bit of math that may put some folks off. I'm using the Konvajs HTML5 canvas library but the code is easily transportable to your own lib. Also, this example is

问题 In my application, I need to detect the mouse events on the edge / border / stroked part of a shape - but not on the filled part. I have not found a way to do this. I do not know how to get started with this but here is pseudo code of what I am trying to do. shape.on('mousemove', function () { if (mouse on the edge of the shape) { // change the cursor to a star } else { // do nothing } }); 回答1: To detect mouse hits on the edge of a shape only, use the fillEnabled:false property. What this

问题 I'm currently following this guide to select shapes in the stage and put them inside a Transformer. If possible, I'd like to drag an entire Transformer with all of its content without touching any of the shapes inside. For example, I have two lines that are far from each other. Both of them are nodes inside a Transformer and can be dragged as long as I click one of those 2 lines. However, if I tried to drag from any of the empty area inside the Transformer nothing would happen (or the

问题 I'm currently following this guide to select shapes in the stage and put them inside a Transformer. If possible, I'd like to drag an entire Transformer with all of its content without touching any of the shapes inside. For example, I have two lines that are far from each other. Both of them are nodes inside a Transformer and can be dragged as long as I click one of those 2 lines. However, if I tried to drag from any of the empty area inside the Transformer nothing would happen (or the

问题 I'm currently following this guide to select shapes in the stage and put them inside a Transformer. If possible, I'd like to drag an entire Transformer with all of its content without touching any of the shapes inside. For example, I have two lines that are far from each other. Both of them are nodes inside a Transformer and can be dragged as long as I click one of those 2 lines. However, if I tried to drag from any of the empty area inside the Transformer nothing would happen (or the