public virtual void DrawLine(Position <float> start, Position <float> end, Color <float> color,
float padding = 2.0f)
{
//draw line with start and end position
//padding means the width of line
//color.Alpha means the opacity of line
//first, we compute the matrix of world transform
MatrixData matrixData = new MatrixData();
Vector2 vector = new Vector2(end.X - start.X, end.Y - start.Y);
//1.compute the scale component, x-component is euqal the length of line, y-component is equal the padding
matrixData.World = Matrix4x4.CreateScale(vector.Length(), padding, 1.0f);
//2.compute the angle of rotate, we only rotate it at the z-axis
matrixData.World *= Matrix4x4.CreateRotationZ((float)Math.Atan2(vector.Y, vector.X), new Vector3(0, padding * 0.5f, 0));
//3.compute the translation, the position of start, but the y is start.y - padding * 0.5f
matrixData.World *= Matrix4x4.CreateTranslation(new Vector3(start.X, start.Y - padding * 0.5f, 0));
//4.keep transform matrix data
matrixData.World *= Transform;
//set project matrix
matrixData.Project = mProject;
//second, we set the render config
RenderConfig renderConfig = new RenderConfig()
{
Color = color
};
//update buffer
mMatrixDataBuffer.Update(matrixData);
mRenderConfigBuffer.Update(renderConfig);
//set buffer and shader
mDevice.SetPixelShader(mColorPixelShader);
mDevice.SetVertexBuffer(mSquareVertexBuffer);
mDevice.SetIndexBuffer(mSquareIndexBuffer);
mDevice.SetBuffer(mMatrixDataBuffer, mMatrixDataBufferSlot, GpuShaderType.VertexShader);
mDevice.SetBuffer(mRenderConfigBuffer, mRenderConfigBufferSlot, GpuShaderType.PixelShader);
//draw
mDevice.DrawIndexed(6, 0, 0);
}
private void DrawImage(Rectanglef rectangle, Image image, Colorf color, GuiRenderMode mode)
{
//fill rectangle with texture
//the result color's alpha is equal texture.alpha * opacity
//do not render image
if (image.GpuTexture == null)
{
return;
}
var transform = new GuiTransform();
var renderConfig = new GuiRenderConfig()
{
Color = color, Config = new Vector4((int)mode)
};
//1.scale the rectangle
transform.World = Matrix4x4.CreateScale(rectangle.Right - rectangle.Left, rectangle.Bottom - rectangle.Top, 1.0f);
//2.translate it
transform.World *= Matrix4x4.CreateTranslation(rectangle.Left, rectangle.Top, 0.0f);
//3.keep transform matrix data
transform.World *= Transform;
//set projection matrix
transform.Project = mProject;
mTransformBuffer.Update(transform);
mRenderConfigBuffer.Update(renderConfig);
mDevice.SetVertexBuffer(mSquareVertexBuffer);
mDevice.SetIndexBuffer(mSquareIndexBuffer);
mDevice.SetBuffer(mTransformBuffer, mTransformBufferSlot, GpuShaderType.All);
mDevice.SetBuffer(mRenderConfigBuffer, mRenderConfigBufferSlot, GpuShaderType.All);
mDevice.SetResourceUsage(image.GpuResourceUsage, mTextureSlot, GpuShaderType.All);
mDevice.DrawIndexed(6, 0, 0);
}
public void FillBezier(Position <float>[] controls, Color <float>[] colors)
{
Utility.Assert(controls.Length >= 3 && colors.Length >= 3);
Utility.Assert(Mode == RenderMode.Fill);
Vertex[] vertices = new Vertex[3];
for (int i = 0; i < 3; i++)
{
vertices[i] = new Vertex()
{
Position = new Vector3(controls[i].X, controls[i].Y, 0),
Color = new Vector4(colors[i].Red, colors[i].Green, colors[i].Blue, colors[i].Alpha)
};
}
vertices[0].TexCoord = new Vector2(0, 0);
vertices[1].TexCoord = new Vector2(0.5f, 0);
vertices[2].TexCoord = new Vector2(1, 1);
TransformMatrix transform = new TransformMatrix()
{
World = Transform,
Projection = mProjection
};
var transformMatrix = transform.World * transform.Projection;
TrianglePoints trianglePoints = new TrianglePoints()
{
Position0 = Vector4.Transform(vertices[0].Position, transformMatrix),
Position1 = Vector4.Transform(vertices[1].Position, transformMatrix),
Position2 = Vector4.Transform(vertices[2].Position, transformMatrix),
};
TriangleColors triangleColors = new TriangleColors()
{
Color0 = vertices[0].Color,
Color1 = vertices[1].Color,
Color2 = vertices[2].Color
};
var size = new Vector4(mCanvasSize.Width * 0.5f, mCanvasSize.Height * 0.5f, 0, 0);
trianglePoints.Position0 = (trianglePoints.Position0 + new Vector4(1)) * size;
trianglePoints.Position1 = (trianglePoints.Position1 + new Vector4(1)) * size;
trianglePoints.Position2 = (trianglePoints.Position2 + new Vector4(1)) * size;
trianglePoints.Position0.Y = mCanvasSize.Height - trianglePoints.Position0.Y;
trianglePoints.Position1.Y = mCanvasSize.Height - trianglePoints.Position1.Y;
trianglePoints.Position2.Y = mCanvasSize.Height - trianglePoints.Position2.Y;
//update data to gpu
mFillVertexBuffer.Update(vertices);
mTransformBuffer.Update(transform);
mTrianglePointsBuffer.Update(trianglePoints);
mTriangleColorsBuffer.Update(triangleColors);
mDevice.SetVertexBuffer(mFillVertexBuffer);
mDevice.SetIndexBuffer(mFillIndexBuffer);
mDevice.SetBuffer(mTransformBuffer, 0);
mDevice.SetBuffer(mTrianglePointsBuffer, 1);
mDevice.SetBuffer(mTriangleColorsBuffer, 2);
mDevice.DrawIndexed(3);
}