How to use android canvas to draw a Rectangle with only topleft and topright corners round?

Question

I found a function for rectangles with all 4 corners being round, but I want to have just the top 2 corners round. What can I do?

canvas.drawRoundRect(new Re         


        

Answer 1

Here is my answer to the above question. Here, I have created Kotlin extension function which uses Path along with the quadTo function which can be used in lower-level APIs also.

fun Canvas.drawRoundRectPath(
rectF: RectF,
radius: Float,
roundTopLeft: Boolean,
roundTopRight: Boolean,
roundBottomLeft: Boolean,
roundBottomRight: Boolean,
paint: Paint) {

val path = Path()

//Move path cursor to start point
if (roundBottomLeft) {
    path.moveTo(rectF.left, rectF.bottom - radius)
} else {
    path.moveTo(rectF.left, rectF.bottom)
}

// drawing line and rounding top left curve
if (roundTopLeft) {
    path.lineTo(rectF.left, rectF.top + radius)
    path.quadTo(rectF.left, rectF.top, rectF.left + radius, rectF.top)
} else {
    path.lineTo(rectF.left, rectF.top)
}

// drawing line an rounding top right curve
if (roundTopRight) {
    path.lineTo(rectF.right - radius, rectF.top)
    path.quadTo(rectF.right, rectF.top, rectF.right, rectF.top + radius)
} else {
    path.lineTo(rectF.right, rectF.top)
}

// drawing line an rounding bottom right curve
if (roundBottomRight) {
    path.lineTo(rectF.right, rectF.bottom - radius)
    path.quadTo(rectF.right, rectF.bottom, rectF.right - radius, rectF.bottom)
} else {
    path.lineTo(rectF.right, rectF.bottom)
}

// drawing line an rounding bottom left curve
if (roundBottomLeft) {
    path.lineTo(rectF.left + radius, rectF.bottom)
    path.quadTo(rectF.left, rectF.bottom, rectF.left, rectF.bottom - radius)
} else {
    path.lineTo(rectF.left, rectF.bottom)
}
path.close()

drawPath(path, paint)
}

We can call the function with canvas object and pass the RectF with the dimension on which we want to apply the curve.

Also, we can pass the boolean for the corners which we want to round. This answer can further be customized to accept radius for individual corners.