canvas

问题 I have an online calculator that i want to automate some operations for, like subtraction, division, etc. but the thing is that there are no elements since it is a canvas app calculator (link below). I'm wondering how can i click the buttons so im able to automate some operations? The online calculator im trying to automate: https://www.online-calculator.com/full-screen-calculator/ The canvas HTML code <canvas id="canvas" width="335" height="434" style="position: absolute; display: block;

问题 I tried with following code, But this code is not working as expected. Actually I hesitated to ask help for this simple solution, But I have wasted lots of time, finally I came here. deltaX = bounds.right - bounds.left; deltaY = bounds.bottom - bounds.top; double distance = Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2)); float arrowLength= (float) (distance / 3); float lineAngle = (float) Math.atan2(deltaY, deltaX); float angle = (float) Math.toRadians(20); float sinValue = (float) Math

问题 how can I set the z-index of tkinter canvas elements (circle, rectangle) on initial startup of the canvas? Or can I set a z-index directly when drawing e.g. a circle? Unfortunately I could not do much with canvas.tag_lower("tag_name") . I thought this command moves all elements of a tag one level back - is that so? class CanvasGui(tk.Canvas): def __init__(self, master): super().__init__(master, bg="#FFF", highlightthickness=0, borderwidth=0) self.pack(fill="both", expand=True) self

问题 how can I set the z-index of tkinter canvas elements (circle, rectangle) on initial startup of the canvas? Or can I set a z-index directly when drawing e.g. a circle? Unfortunately I could not do much with canvas.tag_lower("tag_name") . I thought this command moves all elements of a tag one level back - is that so? class CanvasGui(tk.Canvas): def __init__(self, master): super().__init__(master, bg="#FFF", highlightthickness=0, borderwidth=0) self.pack(fill="both", expand=True) self

问题 I'm facing a problem with the Canvas clip function. I got the coordinates of the border of the first star on the following picture, but when I clip along the coordinates and then erase the rest I am left with some whitespaces around the star. Some edges like the bottom right ones work fine, but the others don't. I checked the coordinates by hand via Gimp and they're perfectly aligned along the border (clip border is running on the white pixels touching the outter black border) Coordinates

问题 I'm facing a problem with the Canvas clip function. I got the coordinates of the border of the first star on the following picture, but when I clip along the coordinates and then erase the rest I am left with some whitespaces around the star. Some edges like the bottom right ones work fine, but the others don't. I checked the coordinates by hand via Gimp and they're perfectly aligned along the border (clip border is running on the white pixels touching the outter black border) Coordinates

问题 I'm having trouble fixing panning in this example - it works fine unless you move the zoomed image and then zoom again(offset is set to default value and the view jumps to initial position - http://jsfiddle.net/p2Qzg/). Any ideas on how to fix that? I've been trying to solve that for three days now, without any good results. var canvas= document.getElementById("myCanvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; var stage = new createjs.Stage("myCanvas");

问题 I'm having trouble fixing panning in this example - it works fine unless you move the zoomed image and then zoom again(offset is set to default value and the view jumps to initial position - http://jsfiddle.net/p2Qzg/). Any ideas on how to fix that? I've been trying to solve that for three days now, without any good results. var canvas= document.getElementById("myCanvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; var stage = new createjs.Stage("myCanvas");

问题 I am a beginner in Python and I am not clear about the function surface.blit() . What does it do? How does it works? I have come across the following points as to how to create it. Create a canvas of desired size Create a surface of smaller size containing the object to be displayed. Define the Rect value of the surface. Blit (overlap) the surface on the canvas at the rect position Syntax: canvas.blit(surface, surfacerect) Why is only rect used? Can it be any other shape? 回答1: Putting this in

问题 Is there a way to draw a transparent text on form that has some controls? If I use TLabel control, it would always show behind controls on the form. 回答1: You cannot use a TLabel control, since it is not a windowed control, and therefore it will be hidden by every windowed child control of the form. You could use a TStaticText , which is indeed a windowed control (a STATIC control), but it will be a bit difficult to make it truly transparent, I'd suppose. You can use layered windows for this: