Need help with DLANGUI

[Vadim Lopatin via Digitalmars-d-learn]

On Tuesday, 24 March 2015 at 13:31:06 UTC, Eric wrote:
>
>>
>> BTW, why do you need FreeImage to create image? Isn't it just 
>> possible inside dlangui?
>
> This is basically my question. Is there a drawing engine that
> can draw lines, circles, and shapes as well as single pixels?
>
> -Eric

Hello,

I've implemented CanvasWidget today as convenient way of custom 
drawing, and added drawPixel and drawLine methods to DrawBuf.

See example1 / Canvas tab.

Sample code:

	CanvasWidget canvas = new CanvasWidget("canvas");
	canvas.layoutWidth(FILL_PARENT).layoutHeight(FILL_PARENT);
	canvas.onDrawListener = delegate(CanvasWidget canvas, DrawBuf 
buf, Rect rc) {
		buf.fill(0xFFFFFF);
		int x = rc.left;
		int y = rc.top;
		buf.fillRect(Rect(x+20, y+20, x+150, y+200), 0x80FF80);
		buf.fillRect(Rect(x+90, y+80, x+250, y+250), 0x80FF80FF);
		canvas.font.drawText(buf, x + 40, y + 50, "fillRect()"d, 
0xC080C0);
		buf.drawFrame(Rect(x + 400, y + 30, x + 550, y + 150), 
0x204060, Rect(2,3,4,5), 0x80704020);
		canvas.font.drawText(buf, x + 400, y + 5, "drawFrame()"d, 
0x208020);
		canvas.font.drawText(buf, x + 300, y + 100, "drawPixel()"d, 
0x000080);
		for (int i = 0; i < 80; i++)
			buf.drawPixel(x+300 + i * 4, y+140 + i * 3 % 100, 0xFF0000 + i 
* 2);
		canvas.font.drawText(buf, x + 200, y + 250, "drawLine()"d, 
0x800020);
		for (int i = 0; i < 40; i+=3)
			buf.drawLine(Point(x+200 + i * 4, y+290), Point(x+150 + i * 7, 
y+420 + i * 2), 0x008000 + i * 5);
	};