canvas

问题 These days, I need to draw many images on a canvas. The canvas size is 800x600px, and I have many images of 256x256px(some is smaller) to draw on it, these small images will compose a complete image on the canvas. I have two ways to implement this. First, if I use canvas 2D context, that is context = canvas.getContext('2d') , then I can just use context.drawimage() method to put every image on the proper location of the canvas. Another way, I use WebGL to draw these images on the canvas. On

问题 These days, I need to draw many images on a canvas. The canvas size is 800x600px, and I have many images of 256x256px(some is smaller) to draw on it, these small images will compose a complete image on the canvas. I have two ways to implement this. First, if I use canvas 2D context, that is context = canvas.getContext('2d') , then I can just use context.drawimage() method to put every image on the proper location of the canvas. Another way, I use WebGL to draw these images on the canvas. On

问题 I want to do a basic procedure that draws something (let's say a triangle, for simplicity) on any control's (button, panel, etc) canvas: procedure DrawTriangle(Control: TCustomControl); In this function I need to use Control.Width & Control.Height to know how big is the control. Turns out to be more difficult than imagined because Canvas is protected. A solution would be to obtain the canvas of the control inside the procedure: VAR ParentControl: TWinControl; canvas: TCanvas; begin

问题 I'm making a light weight painting application with JavaFx. I've been having some issues with my LayerController class and it's methods addLayer etc. So I thought that writing some JUunit test cases would be a good idea to check the correctness of my methods. To make the story short, I'm painting on a Canvas using its GraphicsContext in a selfmade class which I call PaintGraphics . This class does all the painting. The LayerController needs a PaintGraphics to do its work on the layers. But it

问题 I want to hover over a shape I created in Canvas (JavaFx) and when hovering over with the mouse I want a text output pop-up to display. Is there a built in function for this? I can't find how to do it anywhere... 回答1: Unlike with the scene graph, a Canvas has no notion of what it contains. It's nothing but a two-dimensional array of pixels and provides no further distinctions than that. If you want to know if and when the mouse hovers over a "shape" in the Canvas you'll have to keep track of

问题 I want to hover over a shape I created in Canvas (JavaFx) and when hovering over with the mouse I want a text output pop-up to display. Is there a built in function for this? I can't find how to do it anywhere... 回答1: Unlike with the scene graph, a Canvas has no notion of what it contains. It's nothing but a two-dimensional array of pixels and provides no further distinctions than that. If you want to know if and when the mouse hovers over a "shape" in the Canvas you'll have to keep track of

问题 I've been trying to fix an issue with my site for the past week to no avail. I'm using Curtains.js and I just want to display multiple planes on the home page. I've got that working, but every plane after the first shifts up, overlaps or is overlapped. I've tested the code on other shopify themes, and only the first plane is displayed properly as well. Any help would be much appreciated. <script> window.addEventListener("load", function () { var curtains = new Curtains({ container: "planes

问题 I've been trying to fix an issue with my site for the past week to no avail. I'm using Curtains.js and I just want to display multiple planes on the home page. I've got that working, but every plane after the first shifts up, overlaps or is overlapped. I've tested the code on other shopify themes, and only the first plane is displayed properly as well. Any help would be much appreciated. <script> window.addEventListener("load", function () { var curtains = new Curtains({ container: "planes

问题 I've been trying to fix an issue with my site for the past week to no avail. I'm using Curtains.js and I just want to display multiple planes on the home page. I've got that working, but every plane after the first shifts up, overlaps or is overlapped. I've tested the code on other shopify themes, and only the first plane is displayed properly as well. Any help would be much appreciated. <script> window.addEventListener("load", function () { var curtains = new Curtains({ container: "planes

问题 I've been trying to fix an issue with my site for the past week to no avail. I'm using Curtains.js and I just want to display multiple planes on the home page. I've got that working, but every plane after the first shifts up, overlaps or is overlapped. I've tested the code on other shopify themes, and only the first plane is displayed properly as well. Any help would be much appreciated. <script> window.addEventListener("load", function () { var curtains = new Curtains({ container: "planes