在Android中绘制自定义形状拖到画布 [英] Drawing custom shape onto Canvas in Android

问题描述

我已经被这一个有点难倒了，所以我想我会问这里看看如果任何人有任何指针。

在简单地说，我有一个应用程序，我想多复杂的形状被绘制到画布上，然后将被绘制到屏幕上（我将实现围绕在这个问题的回答提出的大帆布平移： 安卓：绘画和旋转的画布）

我去究竟是如何做有关创建自定义形状和Android中的任意位置/旋转绘制它在画布？

下面是一个简单的自定义形状的例子，因为我已经尽力实现它至今（通常他们会在运行时创建的）

 公共类符号{
    公共位图B = Bitmap.createBitmap（500，500，Bitmap.Config.ARGB_8888）;
    公共符号（）{
        帆布帆布=新的Canvas（二）;;
        涂料粉刷=新的油漆（）;
        paint.setColor（Color.GRAY）;
        paint.setStyle（Paint.Style.STROKE）;
        paint.setTextSize（25）;
        paint.setStrokeWidth（4）;
        paint.setDither（真）;
        paint.setStrokeJoin（Paint.Join.ROUND）;
        paint.setStrokeCap​​（Paint.Cap.ROUND）;
        paint.setAntiAlias​​（真）;
        字符串str =TestStr;
        canvas.drawText（STR，250,250，油漆）;
    }
}
 

解决方案

哇，我derped在这一个铁杆。

<一个href=\"http://stackoverflow.com/questions/5186212/android-canvas-drawbitmap-performance-issue\">Android:

canvas.drawBitmap性能问题

在我的主类造万物加入这个快乐的，至少就这个简单的例子了：

 符号s =新符号（）;
canvas.save（）;
canvas.rotate（5）;
canvas.drawBitmap（S.B，0,0，NULL）;
canvas.restore（）;
 

I've been stumped by this one for a little bit, so I figured I'd ask here to see if anyone has any pointers.

In a nutshell, I have an app where I want multiple complex shapes to be drawn onto a canvas, which will then be drawn onto the screen (I'll be implementing panning around the large canvas as suggested in this question's answer: Android: Drawing and rotating on a canvas)

How exactly do I go about creating a custom shape and drawing it at arbitrary locations/rotations on a Canvas in Android?

Below is an example of a simple custom shape, as I've tried to implement it so far (typically they'd be created at run-time)

public class Symbol {
    public Bitmap b = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888);
    public Symbol() {
        Canvas canvas = new Canvas(b);;
        Paint paint = new Paint();
        paint.setColor(Color.GRAY);
        paint.setStyle(Paint.Style.STROKE);
        paint.setTextSize(25);
        paint.setStrokeWidth(4);
        paint.setDither(true);                    
        paint.setStrokeJoin(Paint.Join.ROUND);    
        paint.setStrokeCap(Paint.Cap.ROUND);      
        paint.setAntiAlias(true);  
        String str="TestStr";
        canvas.drawText(str, 250,250, paint);
    }
}

解决方案

Wow, I derped hardcore on this one.

Android: canvas.drawBitmap performance issue

Adding this in my main class made everything happy, at least as far as this simple case went.:

Symbol s = new Symbol();
canvas.save();
canvas.rotate(5);
canvas.drawBitmap(s.b, 0,0, null);
canvas.restore();

这篇关于在Android中绘制自定义形状拖到画布的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！