Skia Fiddle

Options

Width Height

check_box_outline_blank check_box Text Only [Use SkDebugf()]

check_box_outline_blank check_box sRGB

check_box_outline_blank check_box F16

check_box_outline_blank check_box Animation

check_box_outline_blank check_box Offscreen Render Target

Width Height Sample Count

check_box_outline_blank check_box Texturable

check_box_outline_blank check_box MipMap

This global is now defined:

GrBackendRenderTarget backEndRenderTarget;

GrBackendTexture backEndTextureRenderTarget;

Optional source image

check_box_outline_blank check_box MipMap

These globals are now defined:

SkBitmap source;
sk_sp<SkImage> image;
GrBackendTexture backEndTexture; // GPU Only.

Note:

Adding comments with SK_FOLD_START and SK_FOLD_END creates foldable code blocks.
These blocks will be folded by default and are useful for highlighting specific lines of code.
You can also use the keyboard shortcuts Ctrl+S and Ctrl+E in the code editor to set them.

xxxxxxxxxx
 
​
#include <math.h>
// draws a line starting at (x, y), at an angle, with length len
// recursion goes to 11 level
// at the last two levels, line is drawn in green.
void drawTree(int x, int y, int angle, int len, int level, SkCanvas *canvas, SkPaint paint) {
    // the other end point of the line, is obtained by moving len distance
    // at an angle
    int x2  = (int) x - len *cos(2*3.14*angle/360.0); 
    int y2  =  (int) y + len * sin(2*3.14*angle/360.0);
​
  
    canvas->drawLine(x, y, x2, y2, paint);
    paint.setStrokeWidth(10 - level);
    if (level <= 10) {
        drawTree(x2,y2, angle - 20, (1-level/20.0)*len, level+1, canvas, paint);
        drawTree(x2,y2, angle + 20, (1-level/20.0)*len, level +1, canvas, paint);    
    }
​
}
​
​
void draw(SkCanvas* canvas) {
    canvas->drawColor(SK_ColorWHITE);
​
    SkPaint paint;
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(10);
    paint.setColor(0xff4285F4);
    paint.setAntiAlias(true);
    paint.setStrokeCap(SkPaint::kRound_Cap);
    //canvas->drawLine(500, 0, 500, 100, paint);
    
    drawTree(500,1000,-90, 100,0, canvas, paint);
}