I have been trying out dlanui, and I am able to create an image
with FreeImage and display it with an ImageWidget.  However this
requires that I write the image out to disk, and then load it again
to display it.  Is there any way I can update or create the image
in memory without going to disk?

Thanks,

Eric

On Monday, 23 February 2015 at 19:41:30 UTC, Eric wrote:
>
> I have been trying out dlanui, and I am able to create an image
> with FreeImage and display it with an ImageWidget.  However this
> requires that I write the image out to disk, and then load it again
> to display it.  Is there any way I can update or create the image
> in memory without going to disk?
>
> Thanks,
>
> Eric

Hello,

Sorry for delayed answer.
Is your question still actual?

You can use something like
// create RGBA8888 drawing buffer
ColorDrawBuffer buf = new ColorDrawBuffer(width, height);
// copy pixels into buf from your custom image
// .........
// put into DrawBufRef
DrawBufRef imageDrawBuf = buf;
// create image drawable
DrawableRef myCustomImageDrawable = new ImageDrawable(imageDrawBuf);
// set drawable of ImageWidget
imageWidget.drawable = myCustomImageDrawable;

There was code in dlangui.graphics.image which could copy FreeImage images to ColorDrawBuf, but in recent version it's removed. You can check github revision history to get proper code.

BTW, why do you need FreeImage to create image? Isn't it just possible inside dlangui?

>
> 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

On 25/03/2015 2:31 a.m., 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


If you have some way to draw you might be interested in my LineGraph[0]. It only handles getting coordinates to draw by. But I don't see why shapes couldn't be added.

[0] https://github.com/Devisualization/util/blob/master/source/core/devisualization/util/core/linegraph.d

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);
	};